Quick answer: A dehumidifier’s electricity use depends on its exact model, electrical input, humidity load, operating mode, and how often its compressor runs. For a unit drawing 370 watts continuously, one hour uses 0.37 kWh. Six equivalent full-power hours use 2.22 kWh. At an illustrative electricity rate of $0.18/kWh, that costs about $0.40 a day or $11.99 over 30 identical days. This is a calculation scenario, not a U.S. household average.
Before estimating your bill: Look for your model’s wattage in its specifications, consult your bill for the price per kWh, and distinguish hours the machine is switched on from equivalent hours at its assumed electrical draw. A humid basement can lead to very different operation than a dry bedroom.
How many watts does a dehumidifier use?
There is no single wattage for all portable dehumidifiers. Published specifications vary by model, and the pints-per-day rating measures moisture removal capacity rather than electrical power. Here are three specific manufacturer examples, not market averages or recommendations to buy these products:
| Frigidaire model | Rated capacity | Manufacturer-listed watts | Manufacturer source |
|---|---|---|---|
| FHDD2233Y1 | 22 pints/day | 250 W | Product specifications |
| FFAD3534W1 | 35 pints/day | 370 W | Product specifications |
| FFAD5034W1 | 50 pints/day | 515 W | Product specifications |
Specifications are taken from the linked Frigidaire Canada product-support pages, checked October 2026. Model availability, certification status and test conditions may differ; do not assume these models are current U.S. ENERGY STAR Version 6.0 listings. Wattage from published specifications also does not guarantee a constant draw in every operating mode.
How to calculate dehumidifier kWh and electricity cost
Use this basic method when you know the electrical draw and can estimate equivalent hours at that draw:
Energy (kWh) = power (watts) ÷ 1,000 × equivalent operating hours.
Electricity cost = kWh × your electricity rate ($/kWh).
Dehumidifier Electricity Cost Calculator
Estimate costs using your unit’s power rating, daily switched-on hours and an assumed compressor-on percentage. Edit every input; the defaults are examples, not U.S. averages.
Monthly energy: 66.60 kWh. Estimates exclude energy when the appliance is switched off, fees, taxes and equipment costs.
Calculation and limitations
Daily kWh = [(running watts × duty fraction) + (compressor-off watts × (1 − duty fraction))] × switched-on hours ÷ 1,000. Multiply by your rate in dollars per kWh; monthly figures multiply by the days selected. Compressor-off fan and standby draw may not be zero. This simple two-state model cannot capture variable compressor speed, defrost, changing humidity, or other operating modes. A correctly rated kWh monitor over representative days is more accurate.
Worked example: a 370-watt dehumidifier
- 370 watts ÷ 1,000 = 0.37 kW.
- At six equivalent full-power hours per day: 0.37 × 6 = 2.22 kWh/day.
- At a hypothetical $0.18/kWh: 2.22 × $0.18 = $0.3996/day, or about $0.40.
- For 30 days with identical use: 2.22 × 30 = 66.6 kWh, costing $11.99.
The six-hour figure and $0.18/kWh price are illustrative assumptions. Your unit might be switched on for 24 hours yet accumulate fewer equivalent full-draw hours because its compressor cycles. Fan-only and standby consumption still matter, so do not assume that time with the compressor off means zero electricity use.
Dehumidifier electricity use per day and per month
The following table illustrates three model-specific manufacturer wattages under a common assumption: six equivalent hours per day, 30 days per month, and an illustrative rate of $0.18/kWh. The wattages are sourced; the runtime and electricity price are not typical-use claims.
| Assumed draw | kWh in 6 hours | Cost/day | kWh/30 days | Cost/30 days |
|---|---|---|---|---|
| 250 W | 1.50 | $0.27 | 45.0 | $8.10 |
| 370 W | 2.22 | $0.40 | 66.6 | $11.99 |
| 515 W | 3.09 | $0.56 | 92.7 | $16.69 |
Why your bill can differ: Humidity, temperature, airflow, setpoint, drainage configuration, appliance controls and actual power draw all affect measured energy use. Your utility bill may also include fixed charges and other fees not captured by a simple kWh calculation.
Does running a dehumidifier 24/7 use a lot of electricity?
Being plugged in or set to run continuously is not the same as drawing its full listed power for every minute. Some dehumidifiers shut off the compressor once the selected humidity is reached, while their fan or control electronics may continue to consume power. Other settings may run more continuously.
For perspective, a hypothetical 370 W constant draw for a full 24-hour day would be 8.88 kWh, or $1.60/day at $0.18/kWh. Over 30 identical days that would be 266.4 kWh, or $47.95. This is a continuous-power upper-use scenario for that assumed draw, not a prediction or a guaranteed upper bound for any real model.
To estimate realistically, measure the entire appliance over representative days or use a smart plug/energy meter that is appropriately rated for the dehumidifier’s electrical load and the manufacturer’s safety requirements. Do not use an underspecified meter, extension cord, or power strip.
What changes the amount of energy a dehumidifier uses?
Indoor humidity and moisture entry
A wet basement, water intrusion, outdoor air leakage, wet laundry or persistent moisture source can increase the amount of moisture the equipment has to remove. Correcting the source can matter more than changing a timer.
The humidity setting and cycling pattern
A lower target relative humidity can require more compressor operation. Instead of assuming a single duty cycle for all homes, observe the unit and record electricity use over time.
Temperature, placement and maintenance
Operating conditions and restricted airflow influence performance. Follow the manufacturer’s instructions for clearance, filters, cleaning and suitable room temperatures. If the unit repeatedly ices up or cannot lower humidity, investigate the room conditions and appliance rather than simply running it longer.
Capacity and efficiency
A higher pints-per-day capacity is not automatically equivalent to a higher or lower electricity bill. Compare actual product efficiency, capacity and how much work the unit must do in your home.
What does ENERGY STAR IEF mean for dehumidifiers?
Integrated Energy Factor (IEF) measures the amount of water a dehumidifier removes per unit of electricity under a standardized procedure, expressed as liters per kWh (L/kWh). A higher IEF generally indicates better efficiency for the applicable testing category. It is not a simple watts rating, and it should not be inserted into the basic cost formula as if it were power input.
ENERGY STAR Version 6.0 requirements became effective October 1, 2025. For certified portable models, minimum IEF requirements vary with capacity. ENERGY STAR’s current Version 6.0 efficiency table lists 1.70, 2.01 and 3.30 L/kWh for its three capacity groups. Check the exact capacity-band definitions in the official table when evaluating a particular model, especially at a boundary between categories. Check the official listing for a particular model rather than assuming that an older ENERGY STAR label means current Version 6.0 certification.
To compare actual certified products, use the ENERGY STAR certified dehumidifiers dataset and compare like-for-like capacity classes.
Portable vs whole-home dehumidifier electricity use
Portable models treat a room or zone; ducted whole-home models serve a larger area and may interact with HVAC systems. Comparing two systems only by nameplate watts is misleading when they serve different moisture loads. Whole-home equipment also has separate ENERGY STAR efficiency categories and installation considerations. See the official ENERGY STAR dehumidifier buying guidance.
How to measure your dehumidifier’s real electricity use
- Find the exact model and its input power information in the manual or specification sheet.
- Locate your electricity price per kWh on your bill; understand whether it includes both energy supply and variable delivery charges.
- If safe and compatible, measure energy used by the unit for several representative days with a correctly rated monitor.
- Record temperature, approximate humidity, selected setpoint and whether the compressor cycles frequently.
- Divide measured kWh by days measured; multiply by 30 for a scenario estimate of similar monthly conditions, then multiply by your electricity rate.
If you need help reading your utility statement, see our plain-English guide to kWh on electric bills. For a general cost calculation, use the BoodBill electricity cost calculator with the energy and rate for your situation.
Frequently asked questions
How much electricity does a dehumidifier use per day?
Calculate watts ÷ 1,000 × equivalent full-draw hours. For example, 370 W × 6 equivalent hours ÷ 1,000 = 2.22 kWh/day. This is a hypothetical operating scenario, not an average.
How much electricity does a dehumidifier use per month?
Multiply your representative daily kWh by the number of days. In the six-hour 370 W example, 2.22 kWh/day × 30 = 66.6 kWh in 30 days. Real humidity and runtime can change from day to day.
Does a 50-pint dehumidifier use more electricity than a 22-pint model?
Not necessarily for the same dehumidification task. Its listed power draw may be higher, but a properly sized, more efficient model may need less running time. Compare actual models, IEF and the moisture removed, not just the pints/day labels.
Can I calculate electricity use from pints per day alone?
No. Pints/day describes moisture-removal capacity at test conditions, not input watts or the length of time the appliance will actually run. Use a verified electrical input specification or measured kWh.
Is an ENERGY STAR dehumidifier guaranteed to cut my electric bill?
No. Certification identifies qualifying efficiency under specified testing rules, but actual savings depend on which unit is replaced, local conditions, runtime, electricity rates, and correct sizing.
The bottom line
To estimate dehumidifier electricity cost, start with the specific model’s electrical input, equivalent running time, and your local electricity rate. Treat all published watt tables and cost examples as estimates, and use measured kWh when possible. For product comparisons, look at IEF and current ENERGY STAR certification as well as the moisture load you need to control.
Dehumidifiers can add to household electricity use alongside cooling equipment. For context, see our air conditioner electricity-use guide and high electric bill troubleshooting guide.
Sources and methodology
- ENERGY STAR — Dehumidifier key efficiency criteria (Version 6.0)
- ENERGY STAR — Testing and capacity
- ENERGY STAR — Dehumidifier guidance
- Frigidaire — FHDD2233Y1 manufacturer specifications
- Frigidaire — FFAD3534W1 manufacturer specifications
- Frigidaire — FFAD5034W1 manufacturer specifications
Editorial methodology: Manufacturer wattage and capacity values are attributed to identified models; all operating-hour and electricity-rate examples are hypothetical arithmetic scenarios. None of these examples represents measured real-world household averages or projected savings. Content reviewed October 2026.